Lightweight down-proof knitted fabric for down jackets
By using composite shell-core hybrid emulsion and modified aramid fiber blending technology, combined with special knitting structure and TPU film lamination, the problems of lightweight, down-proof, and heat insulation of down jacket down-proof knitted fabrics have been solved, and the durability and heat insulation performance of the fabric have been improved.
Patent Information
- Application Number
- CN202610285541.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-10
- Publication Date
- 2026-05-12
AI Technical Summary
Existing down-proof knitted fabrics for down jackets are insufficient in terms of lightweight, down-proof, warmth, and durability. Traditional methods cannot simultaneously meet the requirements for lightweighting and are prone to agglomeration and structural damage during processing.
A composite shell-core hybrid emulsion was prepared by using allyl bromide-modified silica, which was then combined with modified aramid fibers and Solona PTT fibers. Through a special knitting structure and TPU film lamination, a multi-layer barrier structure was formed, which improved the down-proof performance and durability. The porous structure of the aramid fibers also improved the heat insulation effect.
While achieving lightweight design, it significantly improves down-proof performance, enhances fabric durability and insulation, solves the wear and tear problems of traditional fabrics during use, and eliminates the need for a heavy filling layer.
Smart Images
Figure CN122013507A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fabric technology, specifically to a lightweight down jacket anti-down-leakage knitted fabric. Background Technology
[0002] With the upgrading of consumption and the deepening of green and environmentally friendly concepts, lightweight and high-performance down jackets have become the mainstream demand in the market. However, existing down-proof knitted fabrics for down jackets still face many technical bottlenecks in practical applications, and there is an urgent need to improve product performance through innovative processes.
[0003] Regarding down-proof performance, traditional down-proof knitted fabrics are prone to down leakage due to poor control of inter-fiber porosity. Conventional solutions often rely on thickening the coating or high-density weaving, but this significantly increases the fabric weight, contradicting the need for lightweighting. Meanwhile, while inorganic nanoparticle modification technology can improve fabric density, particle agglomeration during processing often leads to uneven modification effects, and agglomeration during drying or dehydration further damages the fabric's structural integrity, making it difficult to form a stable and effective physical barrier.
[0004] Balancing insulation performance with lightweight design is another key challenge. Traditional down jackets primarily rely on thicker filling layers to enhance warmth, which not only increases product weight but also reduces wearing comfort, failing to meet the demands of lightweight down jackets. Furthermore, insufficient fabric durability also hinders product quality improvement. During daily wear and washing, the down-proof knitted fabric of down jackets is subjected to friction, stretching, and other external forces, making it prone to wear and tear, leading to the peeling of the down-proof coating, damage to the fiber structure, and significantly shortening the product's lifespan.
[0005] Therefore, this application develops a manufacturing process for a lightweight down-proof knitted fabric that can simultaneously achieve down-proofness, high-efficiency insulation, lightweight and high durability. This is key to solving the current technical pain points in the down jacket industry and is of great significance to promoting the technological upgrading of the industry. Summary of the Invention
[0006] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a lightweight down-proof knitted fabric for down jackets.
[0007] This invention provides a lightweight down-proof knitted fabric for down jackets, the preparation process of which includes: S1: Preparation of composite shell-core hybrid emulsion; A composite shell-core hybrid emulsion was prepared by modifying silica with allyl bromide, followed by reaction with modified silica, MMA, BA, MAA and HPA as raw materials. S2: Preparation of modified aramid fibers; Aramid fiber solution was prepared by dissolving aramid fibers in potassium tert-butoxide and dimethyl sulfoxide, and adding methanol. Camphor and aramid fiber solution were then mixed and wet-spun. The spun hydrogel fiber was then immersed in an aqueous solution of tert-butoxide and freeze-dried to obtain modified aramid fiber. S3: Preparation of down-proof knitted fabric; Blended fibers are prepared by blending 20-30 parts by weight of modified aramid fiber and 30-40 parts by weight of Sorona PTT fiber. The blended fibers are then knitted on a 32G single-sided circular knitting machine to obtain knitted fabric. The knitted fabric is then dyed, dried, and immersed in a composite shell-core hybrid emulsion for two dips and two nips to obtain finished knitted fabric. The finished knitted fabric is then stretched, set, and heat-pressed to obtain down-proof knitted fabric.
[0008] As a preferred aspect, S1: the preparation of the composite shell-core hybrid emulsion specifically includes the following steps: S1.1: Disperse 2-3 parts by weight of silica in 20-30 parts by weight of deionized water, then homogenize it with ultrasound in an ice bath for 30-40 min at a power of 600-620 W, working for 2 s and pausing for 2 s. Then add 4.5-5 parts by weight of allyl bromide and stir and mix at 65-70℃ for 10-20 min. Then add 10-12 parts by weight of 50wt% sodium hydroxide aqueous solution dropwise using a peristaltic pump over a period of 2-3 h, maintaining a constant temperature and reflux during the dropwise addition. After the dropwise addition is complete, react for 1-2 h, centrifuge at 8000-10000 r / min for 20-30 min, wash and dry the centrifuged precipitate to obtain modified silica. S1.2: 0.5-1 parts by weight of modified silica and 1.5-2 parts by weight of hexadecane, an auxiliary stabilizer, are ultrasonically mixed for 5-10 minutes. Then, 0.5-2 parts by weight of MMA, 15-17 parts by weight of BA, 0.5-2 parts by weight of MAA, and 0.5-2 parts by weight of HPA are added. The mixture is homogenized in an ice bath for 30-40 minutes at a power of 450-480W, with a 2-second working and 2-second pause. Then, 0.35-0.5 parts by weight of SDS and 0.35-0.5 parts by weight of TERGITOL-15-S-40 are added, and homogenization is continued for 30-40 minutes to obtain a pre-emulsion. S1.3: Mix 1 / 3 part by weight of pre-emulsion with 9-12 parts by weight of deionized water, then add 2-3 parts by weight of 5-10 wt% APS aqueous solution at 82-83℃ and react for 15-20 min. Then add the remaining 2 / 3 part by weight of pre-emulsion and a mixture of 0.2-0.3 parts by weight of APS and 10-12 parts by weight of deionized water. Then react at 200-230 r / min for 4-5 h. After the reaction is complete, add ammonia water to adjust to neutrality and filter through a 300-mesh filter cloth to obtain a composite shell-core hybrid emulsion.
[0009] As a preferred aspect, S2: the preparation of modified aramid fibers specifically includes the following steps: S2.1: Cut 2-2.2 parts by weight of commercial aramid fiber into short fibers with a length of 1-2 cm, then wash and dry them. Add 10-12 parts by weight of potassium tert-butoxide and 78-80 parts by weight of dimethyl sulfoxide to the washed and dried short fibers, stir at room temperature for 1-2 hours, and then add a total of 10-12 parts by weight of methanol in 6 portions within 1 hour. After stirring and mixing, let it stand for 7-8 days to obtain an aramid fiber solution. S2.2: Place 1-2 parts by weight of camphor in a container, add aramid fiber solution to the container at 300-500 r / min, stir and mix for 1-2 h to obtain camphor-aramid fiber solution; S2.3: Draw the camphor-aramid fiber solution into a syringe, assemble the syringe with a 150μm orifice needle, fix the syringe to the syringe pump, and use 25-30μL / min. -1 The fiber is injected into the coagulation bath at a speed of 3:1. The coagulation bath is deionized water and the traction ratio is 3:1. The hydrogel fiber is then collected into the reel. S2.4: Immerse the hydrogel fiber in a 25-30wt% tert-butanol aqueous solution, replace the tert-butanol aqueous solution every 48-72h, repeat 3-4 times to displace the camphor and water in the gel, place the displaced gel fiber in a low temperature freezer at -85℃ for 6-8h, and then freeze-dry for 12-14h to obtain modified aramid fiber.
[0010] As a preferred aspect, S3: the preparation of the down-proof knitted fabric specifically includes the following steps: S3.1: Blend fibers are prepared by blending 20-30 parts by weight of modified aramid fiber and 30-40 parts by weight of Solona PTT fiber. The blend fibers are then knitted on a 32G single-sided circular knitting machine to obtain knitted fabric. S3.2: Dye the knitted fabric, dry it to obtain the dried knitted fabric, immerse the knitted fabric in a composite shell-core hybrid emulsion, dip and nibble twice, with a pick-up rate of 80% and an immersion time of 20-30 minutes, then pre-dry at 80-82℃ for 3-5 minutes, and then dry at 110-120℃ for 3-5 minutes to obtain the finished knitted fabric. S3.3: After the finished knitted fabric is stretched and set, the hot melt adhesive machine is preheated to 170-180℃ and the stretched and set knitted fabric is sprayed with adhesive. Immediately after the adhesive spraying is completed, the TPU film is laminated to the knitted fabric. The TPU film is a breathable film made of thermoplastic polyurethane material and is hot-pressed by an LP-type vertical press at a pressure of 0.3-0.5MPa and a speed of 6.5-7m / min. After the heat-pressing is completed, the down-proof knitted fabric is obtained.
[0011] As a preferred aspect, the knitting in step S3.1 specifically includes the following patterns: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27 plain weave needles; 2, 18 floating yarn, plain weave, floating yarn, tuck loop, floating yarn, plain weave needles; 4, 16 tuck loop, floating yarn, plain weave, floating yarn, plain weave, floating yarn; 6, 8, 10, 12, 14 floating yarn, tuck loop, floating yarn, plain weave, floating yarn, tuck loop; 20, 22, 24, 26, 28 plain weave, floating yarn, tuck loop, floating yarn, tuck loop, floating yarn.
[0012] As a preferred aspect, in step S3.1, the plain weave portion has a yarn length of 100-125mm / 50 loops, and the jacquard portion has a yarn length of 50-70mm / 50 loops.
[0013] As a preferred aspect, in step S3.1, the thread length of the plain weave portion is preferably 105-110mm / 50 loops, and the thread length of the jacquard portion is preferably 65-70mm / 50 loops.
[0014] As a preferred aspect, the amount of adhesive sprayed in step S3.3 is 1.5-1.8 g / m³. 2 .
[0015] The present invention has the following advantages: 1. This invention enhances the compatibility of silica with oil-soluble monomers by introducing allyl bromide to modify the surface of silica. A core-shell hybrid emulsion with a core-shell structure is prepared by fine emulsion polymerization. Silica is successfully encapsulated in the latex, forming a core-shell structure. Compared with traditional silane coupling agent modification, which is prone to particle aggregation during the dehydration stage, allyl bromide, with its self-inhibiting polymerization effect, successfully avoids this problem. Each particle is uniformly distributed in the droplet, avoiding the aggregation effect of inorganic nanoparticles. The uniformly dispersed core-shell particles can effectively fill the loop gaps of knitted fabrics, reducing the channels for down to escape from the fabric pores. This improves the down-proof effect from a physical barrier perspective. Furthermore, the rigidity of the inorganic silica core and the toughness of the organic polymer shell work synergistically. When subjected to external forces (such as friction and tension), the shell's flexibility can buffer stress, while the core's rigidity can resist deformation, reducing wear and tear during use and improving the durability of the down-proof knitted fabric.
[0016] 2. This invention utilizes the properties of camphor, which is soluble in dimethyl sulfoxide solution but poorly soluble in water, to prepare aramid aerogel fibers through an internally packed stretching method. By adding camphor as a skeletal support, the camphor solidifies during wet spinning, supporting the pores. Subsequent camphor replacement maintains the unique three-dimensional porous structure of the aerogel, giving the prepared modified aramid fibers excellent thermal insulation properties. The modified aramid fibers themselves possess excellent "self-insulating" capabilities. When blended with other fibers, the fabric can form a "double thermal insulation barrier" through the fiber's own porous structure and the air layer between fibers, significantly improving the thermal insulation effect of lightweight down jackets without relying on a thick filling layer, thus meeting the requirements for lightweight design.
[0017] 3. In terms of weaving technology, this invention adopts a hexagonal jacquard design. Through a special knitting structure, the yarns interweave to form a regular and unique hexagonal pattern. This jacquard structure not only increases the aesthetics and three-dimensionality of the fabric, but also improves the strength and stability of the fabric due to its special interweaving method, reducing the deformation of the fabric during wearing or washing. Furthermore, an environmentally friendly TPU heat-sealing film is used. The TPU film itself has excellent density and puncture resistance. After being laminated with the knitted fabric, it forms a "double barrier" to solve the problem of down leakage. In addition, the TPU film has water resistance and chemical corrosion resistance. After lamination, it can protect the composite shell-core hybrid emulsion coating on the surface of the fabric, reduce the wear or peeling of the coating during washing, and extend the effective period of the anti-down leakage effect.
[0018] 4. This invention uses modified aramid fiber and Solona PTT fiber for blending. This blending strategy cleverly utilizes the characteristics of the two fibers. Solona PTT provides lasting elasticity and shape retention, ensuring freedom of movement and preventing loosening. Modified aramid provides strong bottom layer support and protection, ensuring the fabric is strong and durable. This results in an inner layer fabric with good waterproof and breathable properties, as well as a soft, smooth, and close-fitting feel, providing skin-friendly comfort. It also achieves lightweight down-proof properties. Attached Figure Description
[0019] Figure 1 This is a flowchart illustrating the manufacturing process of the lightweight down-proof knitted fabric used in an embodiment of the present invention.
[0020] Figure 2 This is the weaving pattern used in an embodiment of the present invention. Detailed Implementation
[0021] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this invention.
[0022] Example 1: A lightweight down-proof knitted fabric for down jackets, referenced Figures 1-2,include: S1: Preparation of composite core-shell hybrid emulsion S1.1: Disperse 2 parts by weight of silica in 20 parts by weight of deionized water, then homogenize it by ultrasonication in an ice bath for 30 min at a power of 600 W for 2 s and pause for 2 s. Then add 4.5 parts by weight of allyl bromide and stir and mix at 65 °C for 10 min. Then add 10 parts by weight of 50 wt% sodium hydroxide aqueous solution dropwise using a peristaltic pump over a period of 2 h. During the dropwise addition, maintain a constant temperature and reflux condensation. After the dropwise addition is complete, react for 1 h and centrifuge at 8000 r / min for 20 min. Wash and dry the centrifuged precipitate to obtain modified silica. S1.2: 0.5 parts by weight of modified silica and 1.5 parts by weight of hexadecane, an auxiliary stabilizer, were ultrasonically mixed for 5 min. Then, 0.5 parts by weight of MMA, 15 parts by weight of BA, 0.5 parts by weight of MAA and 0.5 parts by weight of HPA were added. The mixture was homogenized in an ice bath for 30 min at 450W power for 2 s and paused for 2 s. Then, 0.35 parts by weight of SDS and 0.35 parts by weight of TERGITOL-15-S-40 were added, and the mixture was homogenized for another 30 min to obtain a pre-emulsion. S1.3: Mix 1 / 3 part by weight of pre-emulsion and 9 parts by weight of deionized water, then add 2 parts by weight of 5 wt% APS aqueous solution at 82°C and react for 15 min. Then add the remaining 2 / 3 part by weight of pre-emulsion and a mixture of 0.2 parts by weight of APS and 10 parts by weight of deionized water. Then react at 200 r / min for 4 h. After the reaction is complete, add ammonia water to adjust to neutral and filter through a 300-mesh filter cloth to obtain a composite shell-core hybrid emulsion. S2: Preparation of modified aramid fibers S2.1: Cut 2 parts by weight of commercial aramid fiber into short fibers with a length of 1-2 cm, then wash and dry them. Add 10 parts by weight of potassium tert-butoxide and 78 parts by weight of dimethyl sulfoxide to the washed and dried short fibers, stir at room temperature for 1 hour, and then add a total of 10 parts by weight of methanol in 6 portions within 1 hour. After stirring and mixing, let stand for 7 days to obtain an aramid fiber solution. S2.2: Place 1 part by weight of camphor in a container, add aramid fiber solution to the container at 300 r / min, stir and mix for 1 h to obtain camphor-aramid fiber solution; S2.3: Draw the camphor-aramid fiber solution into a syringe, assemble the syringe with a 150μm orifice needle, fix the syringe to the syringe pump, and use 25μL·min -1 The fiber is injected into the coagulation bath at a speed of 3:1. The coagulation bath is deionized water and the traction ratio is 3:1. The hydrogel fiber is then collected into the reel. S2.4: Soak the hydrogel fiber in a 25wt% tert-butanol aqueous solution, replace the tert-butanol aqueous solution every 48h, repeat 3 times to displace camphor and water in the gel, place the displaced gel fiber in a low temperature freezer at -85℃ for 6h, and then freeze-dry for 12h to obtain modified aramid fiber. S3: Preparation of down-proof knitted fabric S3.1: Blend fibers are prepared by blending 20 parts by weight of modified aramid fiber and 30 parts by weight of Solona PTT fiber. The blend fibers are then knitted on a 32G single-sided circular knitting machine. The plain weave portion has a yarn length of 105mm / 50 loops, and the jacquard portion has a yarn length of 65mm / 50 loops. Specifically, the knitting pattern is as follows: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27 plain weave needle exit; 2, 18 float, plain weave, float, tuck, float, plain weave needle exit; 4, 16 tuck, float, plain weave, float, plain weave, float; 6, 8, 10, 12, 14 float, tuck, float, plain weave, float, tuck; 20, 22, 24, 26, 28 plain weave, float, tuck, float, tuck, float, float, to obtain the knitted fabric. S3.2: Dye the knitted fabric, dry it to obtain the dried knitted fabric, immerse the knitted fabric in a composite shell-core hybrid emulsion, dip and nibble twice, with a pick-up rate of 80% and an immersion time of 20 min, then pre-dry at 80℃ for 3 min, and then dry at 110℃ for 3 min to obtain the finished knitted fabric. S3.3: After the finished knitted fabric is stretched and set, the hot melt glue machine is preheated to 170℃, and glue is sprayed onto the stretched and set knitted fabric at a rate of 1.5g / m². 2 Immediately after the adhesive spraying is completed, the TPU film is laminated with the knitted fabric and then hot-pressed using an LP-type vertical rolling mill at a pressure of 0.3 MPa and a speed of 6.5 m / min. After the heat treatment is completed, the down-proof knitted fabric is obtained.
[0023] Example 2: A lightweight down-proof knitted fabric for down jackets, see [link / reference]. Figures 1-2 ,include: S1: Preparation of composite core-shell hybrid emulsion S1.1: Disperse 3 parts by weight of silica in 30 parts by weight of deionized water, then homogenize it by ultrasonication in an ice bath for 30 min at a power of 600 W for 2 s and pause for 2 s. Then add 5 parts by weight of allyl bromide and stir and mix at 65 °C for 10 min. Then add 12 parts by weight of 50 wt% sodium hydroxide aqueous solution dropwise using a peristaltic pump over a period of 2 h. Maintain a constant temperature and reflux during the dropwise addition. After the dropwise addition is complete, react for 1 h and centrifuge at 8000 r / min for 20 min. Wash and dry the centrifuged precipitate to obtain modified silica. S1.2: 1 part by weight of modified silica and 2 parts by weight of hexadecane, an auxiliary stabilizer, are ultrasonically mixed for 5 min. Then, 2 parts by weight of MMA, 17 parts by weight of BA, 2 parts by weight of MAA and 2 parts by weight of HPA are added. The mixture is homogenized in an ice bath for 30 min at 450W power for 2 s and paused for 2 s. Then, 0.5 parts by weight of SDS and 0.5 parts by weight of TERGITOL-15-S-40 are added, and homogenization is continued for 30 min to obtain a pre-emulsion. S1.3: Mix 1 / 3 part by weight of pre-emulsion and 12 parts by weight of deionized water, then add 3 parts by weight of 10 wt% APS aqueous solution at 82°C and react for 15 min. Then add the remaining 2 / 3 part by weight of pre-emulsion and a mixture of 0.3 parts by weight of APS and 12 parts by weight of deionized water. Then react at 200 r / min for 4 h. After the reaction is complete, add ammonia water to adjust to neutral and filter through a 300-mesh filter cloth to obtain a composite shell-core hybrid emulsion. S2: Preparation of modified aramid fibers S2.1: Cut 2.2 parts by weight of commercial aramid fiber into short fibers with a length of 1-2 cm, then wash and dry them. Add 12 parts by weight of potassium tert-butoxide and 80 parts by weight of dimethyl sulfoxide to the washed and dried short fibers, stir at room temperature for 1 hour, and then add a total of 12 parts by weight of methanol in 6 portions within 1 hour. After stirring and mixing, let stand for 7 days to obtain an aramid fiber solution. S2.2: Place 2 parts by weight of camphor in a container, add aramid fiber solution to the container at 300 r / min, stir and mix for 1 h to obtain camphor-aramid fiber solution; S2.3: Draw the camphor-aramid fiber solution into a syringe, assemble the syringe with a 150μm orifice needle, fix the syringe to the syringe pump, and use 25μL·min -1 The fiber is injected into the coagulation bath at a speed of 3:1. The coagulation bath is deionized water and the traction ratio is 3:1. The hydrogel fiber is then collected into the reel. S2.4: Soak the hydrogel fiber in a 30wt% tert-butanol aqueous solution, replace the tert-butanol aqueous solution every 48h, repeat 3 times to displace the camphor and water in the gel, place the displaced gel fiber in a low temperature freezer at -85℃ for 6h, and then freeze-dry for 12h to obtain modified aramid fiber. S3: Preparation of down-proof knitted fabric S3.1: 30 parts by weight of modified aramid fiber and 40 parts by weight of Solona PTT fiber are blended to prepare blended fiber. The blended fiber is knitted on a 32G single-sided circular knitting machine. The plain weave part has a yarn length of 105mm / 50 loops, and the jacquard part has a yarn length of 65mm / 50 loops. Specifically, the needles are: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27 plain weave needle exit; 2, 18 float, plain weave, float, tuck, float, plain weave needle exit; 4, 16 tuck, float, plain weave, float, plain weave, float; 6, 8, 10, 12, 14 float, tuck, float, plain weave, float, tuck; 20, 22, 24, 26, 28 plain weave, float, tuck, float, tuck, float, float, to obtain the knitted fabric. S3.2: Dye the knitted fabric, dry it to obtain the dried knitted fabric, immerse the knitted fabric in a composite shell-core hybrid emulsion, dip and nibble twice, with a pick-up rate of 80% and an immersion time of 20 min, then pre-dry at 80℃ for 3 min, and then dry at 110℃ for 3 min to obtain the finished knitted fabric. S3.3: After stretching and setting the finished knitted fabric, preheat the hot melt glue machine to 170℃ and spray glue onto the stretched and set knitted fabric at a rate of 1.8g / m². 2 Immediately after the adhesive spraying is completed, the TPU film is laminated with the knitted fabric and then hot-pressed using an LP-type vertical rolling mill at a pressure of 0.3 MPa and a speed of 6.5 m / min. After the heat treatment is completed, the down-proof knitted fabric is obtained.
[0024] Example 3: A lightweight down-proof knitted fabric for down jackets, see [link / reference] Figures 1-2 ,include: S1: Preparation of composite core-shell hybrid emulsion S1.1: Disperse 2 parts by weight of silica in 20 parts by weight of deionized water, then homogenize it by ultrasonication in an ice bath for 40 min at a power of 620 W for 2 s and pause for 2 s. Then add 4.5 parts by weight of allyl bromide and stir and mix at 70 °C for 20 min. Then add 10 parts by weight of 50 wt% sodium hydroxide aqueous solution dropwise using a peristaltic pump over a period of 3 h. During the dropwise addition, maintain a constant temperature and reflux condensation. After the dropwise addition is complete, react for 2 h and centrifuge at 10000 r / min for 30 min. Wash and dry the centrifuged precipitate to obtain modified silica. S1.2: 0.5 parts by weight of modified silica and 1.5 parts by weight of hexadecane, an auxiliary stabilizer, were ultrasonically mixed for 10 min. Then, 0.5 parts by weight of MMA, 15 parts by weight of BA, 0.5 parts by weight of MAA and 0.5 parts by weight of HPA were added. The mixture was homogenized in an ice bath for 40 min at 480W, with a 2-second working and 2-second pause. Then, 0.35 parts by weight of SDS and 0.35 parts by weight of TERGITOL-15-S-40 were added, and the mixture was homogenized for another 40 min to obtain a pre-emulsion. S1.3: Mix 1 / 3 part by weight of pre-emulsion and 9 parts by weight of deionized water, then add 2 parts by weight of 5 wt% APS aqueous solution at 83°C and react for 20 min. Then add the remaining 2 / 3 part by weight of pre-emulsion and a mixture of 0.2 parts by weight of APS and 10 parts by weight of deionized water. Then react at 230 r / min for 5 h. After the reaction is complete, add ammonia water to adjust to neutral and filter through a 300-mesh filter cloth to obtain a composite shell-core hybrid emulsion. S2: Preparation of modified aramid fibers S2.1: Cut 2 parts by weight of commercial aramid fiber into short fibers with a length of 1-2 cm, then wash and dry them. Add 10 parts by weight of potassium tert-butoxide and 78 parts by weight of dimethyl sulfoxide to the washed and dried short fibers, stir at room temperature for 2 hours, and then add a total of 10 parts by weight of methanol in 6 portions over 1 hour. After stirring and mixing, let stand for 8 days to obtain an aramid fiber solution. S2.2: Place 1 part by weight of camphor in a container, add aramid fiber solution to the container at 500 r / min, stir and mix for 2 h to obtain camphor-aramid fiber solution; S2.3: Draw the camphor-aramid fiber solution into a syringe, assemble the syringe with a 150μm orifice needle, fix the syringe to the syringe pump, and use 30μL·min -1 The fiber is injected into the coagulation bath at a speed of 3:1. The coagulation bath is deionized water and the traction ratio is 3:1. The hydrogel fiber is then collected into the reel. S2.4: The hydrogel fiber was immersed in a 25wt% tert-butanol aqueous solution, and the tert-butanol aqueous solution was replaced every 72h, and the process was repeated 4 times to displace the camphor and water in the gel. The displaced gel fiber was placed in a low temperature freezer at -85℃ for 8h, and then freeze-dried for 14h to obtain modified aramid fiber. S3: Preparation of down-proof knitted fabric S3.1: Blend fibers are prepared by blending 20 parts by weight of modified aramid fiber and 30 parts by weight of Solona PTT fiber. The blend fibers are then knitted on a 32G single-sided circular knitting machine. The plain weave portion has a yarn length of 110mm / 50 loops, and the jacquard portion has a yarn length of 70mm / 50 loops. Specifically, the knitting pattern is as follows: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27 plain weave needle exit; 2, 18 float, plain weave, float, tuck, float, plain weave needle exit; 4, 16 tuck, float, plain weave, float, plain weave, float; 6, 8, 10, 12, 14 float, tuck, float, plain weave, float, tuck; 20, 22, 24, 26, 28 plain weave, float, tuck, float, tuck, float, float, to obtain the knitted fabric. S3.2: Dye the knitted fabric, dry it to obtain the dried knitted fabric, immerse the knitted fabric in a composite shell-core hybrid emulsion, dip and nibble twice, with a pick-up rate of 80% and an immersion time of 30 min, then pre-dry at 82℃ for 5 min, and then dry at 120℃ for 5 min to obtain the finished knitted fabric. S3.3: After stretching and setting the finished knitted fabric, preheat the hot melt glue machine to 180℃ and spray glue onto the stretched and set knitted fabric at a rate of 1.5g / m². 2 Immediately after the adhesive spraying is completed, the TPU film is laminated with the knitted fabric and then hot-pressed using an LP-type vertical rolling mill at a pressure of 0.5 MPa and a speed of 7 m / min. After the heat treatment is completed, the down-proof knitted fabric is obtained.
[0025] Comparative Example 1 differs from Example 1 in that step S1.1 is removed, and the modified silica in step S1.2 is replaced with coupling agent KH550 modified silica. The remaining steps are unchanged to prepare the down-proof knitted fabric, which is referred to as Comparative Example 1.
[0026] Comparative Example 2 differs from Example 1 in that the soaking and finishing in steps S1 and S3.2 are removed, and the dried knitted fabric is directly stretched and shaped, while the remaining steps remain unchanged to prepare the down-proof knitted fabric. This is referred to as Comparative Example 2.
[0027] Comparative Example 3 differs from Example 1 in that step S2.4 is removed, and the modified aramid fiber in step S3.1 is replaced with conventional aramid fiber, while the remaining steps remain unchanged to prepare the down-proof knitted fabric. This is referred to as Comparative Example 3.
[0028] Comparative Example 4 differs from Example 1 in that it uses conventional plain weave to knit the blended fibers, while the remaining steps remain unchanged to prepare the down-proof knitted fabric.
[0029] The performance of the down-proof knitted fabrics prepared in Examples 1-3 and Comparative Examples 1-2 and 4 was tested three times, and the average value was taken. The test results are shown in Table 1.
[0030] The down-proof property was determined with reference to GB / T12705.1-2024, and the breaking strength was determined with reference to GB / T3923.2-2013.
[0031] Table 1. Performance test results of down-proof knitted fabrics from Examples 1-3 and Comparative Examples 1-2 and 4
[0032] As can be seen from the data in Table 1, the performance of Comparative Example 1 is worse than that of the Example 1. This indicates that the surface modification of silica with allyl bromide introduced in this invention can significantly improve the dispersion ability compared to traditional silane coupling agent modification. The uniformly dispersed particles can effectively fill the loop gaps in the knitted fabric, reducing the channels for down to escape from the fabric pores. Therefore, the number of down feathers escaping from the Example 1 is significantly lower than that of Comparative Example 1. Furthermore, the breaking strength of Comparative Example 2 is worse than that of the Example 1, indicating that the fabric treated with the composite shell-core hybrid emulsion significantly improves the fabric strength and reduces wear and tear during use. The data from Comparative Example 4 shows that the fabric constructed with the special knitting structure of this invention also has a significant improvement in strength and can also improve the down-proof performance to a certain extent.
[0033] The thermal insulation properties of the down-proof knitted fabrics prepared in Examples 1-3 and Comparative Example 3 were tested three times, and the average value was taken. The test results are shown in Table 2. The thermal conductivity was tested at room temperature (25℃) using a Fox200 thermal conductivity meter.
[0034] Table 2. Thermal insulation performance of down-proof knitted fabrics in Examples 1-3 and Comparative Example 3
[0035] As can be seen from the data in Table 2, the fabric prepared by blending the modified aramid fiber prepared in this invention with Solona PTT fiber can reduce the thermal conductivity, thereby giving it good heat insulation performance.
[0036] The water vapor transmission rate and hydrostatic pressure resistance of the down-proof knitted fabrics prepared in Examples 1-3 were measured, and the results are shown in Table 3.
[0037] Water vapor transmission rate was determined according to GB / T12704.1-2009; water resistance was determined according to GB / T4744-2013.
[0038] Table 3. Determination of water vapor transmission rate and hydrostatic pressure resistance of down-proof knitted fabrics in Examples 1-3
[0039] As can be seen from the data in Table 3, the down-proof knitted fabric prepared by this invention has good waterproof and breathable properties.
[0040] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Parts not described in detail in this specification are prior art known to those skilled in the art.
Claims
1. A lightweight down-proof knitted fabric for down jackets, characterized in that, Its preparation process includes: S1: Preparation of composite shell-core hybrid emulsion; A composite shell-core hybrid emulsion was prepared by modifying silica with allyl bromide, followed by reaction with modified silica, MMA, BA, MAA and HPA as raw materials. S2: Preparation of modified aramid fibers; Aramid fiber solution was prepared by dissolving aramid fibers in potassium tert-butoxide and dimethyl sulfoxide, and adding methanol. Camphor and aramid fiber solution were then mixed and wet-spun. The spun hydrogel fiber was then immersed in an aqueous solution of tert-butoxide and freeze-dried to obtain modified aramid fiber. S3: Preparation of down-proof knitted fabric; Blended fibers are prepared by blending 20-30 parts by weight of modified aramid fiber and 30-40 parts by weight of Sorona PTT fiber. The blended fibers are then knitted on a 32G single-sided circular knitting machine to obtain knitted fabric. The knitted fabric is then dyed, dried, and immersed in a composite shell-core hybrid emulsion for two dips and two nips to obtain finished knitted fabric. The finished knitted fabric is then stretched, set, and heat-pressed to obtain down-proof knitted fabric.
2. The lightweight down-proof knitted fabric for down jackets according to claim 1, characterized in that, S1: The preparation of the composite shell-core hybrid emulsion includes the following steps: S1.1: Disperse 2-3 parts by weight of silica in 20-30 parts by weight of deionized water, then homogenize it with ultrasound in an ice bath for 30-40 min at a power of 600-620 W, working for 2 s and pausing for 2 s. Then add 4.5-5 parts by weight of allyl bromide and stir and mix at 65-70℃ for 10-20 min. Then add 10-12 parts by weight of 50wt% sodium hydroxide aqueous solution dropwise using a peristaltic pump over a period of 2-3 h, maintaining a constant temperature and reflux during the dropwise addition. After the dropwise addition is complete, react for 1-2 h, centrifuge at 8000-10000 r / min for 20-30 min, wash and dry the centrifuged precipitate to obtain modified silica. S1.2: 0.5-1 parts by weight of modified silica and 1.5-2 parts by weight of hexadecane, an auxiliary stabilizer, are ultrasonically mixed for 5-10 minutes. Then, 0.5-2 parts by weight of MMA, 15-17 parts by weight of BA, 0.5-2 parts by weight of MAA, and 0.5-2 parts by weight of HPA are added. The mixture is homogenized in an ice bath for 30-40 minutes at a power of 450-480W, with a 2-second working and 2-second pause. Then, 0.35-0.5 parts by weight of SDS and 0.35-0.5 parts by weight of TERGITOL-15-S-40 are added, and homogenization is continued for 30-40 minutes to obtain a pre-emulsion. S1.3: Mix 1 / 3 part by weight of pre-emulsion with 9-12 parts by weight of deionized water, then add 2-3 parts by weight of 5-10 wt% APS aqueous solution at 82-83℃ and react for 15-20 min. Then add the remaining 2 / 3 part by weight of pre-emulsion and a mixture of 0.2-0.3 parts by weight of APS and 10-12 parts by weight of deionized water. Then react at 200-230 r / min for 4-5 h. After the reaction is complete, add ammonia water to adjust to neutrality and filter through a 300-mesh filter cloth to obtain a composite shell-core hybrid emulsion.
3. The lightweight down-proof knitted fabric for down jackets according to claim 2, characterized in that, S2: The preparation of modified aramid fibers specifically includes the following steps: S2.1: Cut 2-2.2 parts by weight of commercial aramid fiber into short fibers with a length of 1-2 cm, then wash and dry them. Add 10-12 parts by weight of potassium tert-butoxide and 78-80 parts by weight of dimethyl sulfoxide to the washed and dried short fibers, stir at room temperature for 1-2 hours, and then add a total of 10-12 parts by weight of methanol in 6 portions within 1 hour. After stirring and mixing, let it stand for 7-8 days to obtain an aramid fiber solution. S2.2: Place 1-2 parts by weight of camphor in a container, add aramid fiber solution to the container at 300-500 r / min, stir and mix for 1-2 h to obtain camphor-aramid fiber solution; S2.3: Draw the camphor-aramid fiber solution into a syringe, assemble the syringe with a 150μm orifice needle, fix the syringe to the syringe pump, and use 25-30μL / min. -1 The fiber is injected into the coagulation bath at a speed of 3:
1. The coagulation bath is deionized water and the traction ratio is 3:
1. The hydrogel fiber is then collected into the reel. S2.4: Immerse the hydrogel fiber in a 25-30wt% tert-butanol aqueous solution, replace the tert-butanol aqueous solution every 48-72h, repeat 3-4 times to displace the camphor and water in the gel, place the displaced gel fiber in a low temperature freezer at -85℃ for 6-8h, and then freeze-dry for 12-14h to obtain modified aramid fiber.
4. The lightweight down-proof knitted fabric for down jackets according to claim 3, characterized in that, S3: The preparation of down-proof knitted fabric includes the following steps: S3.1: Blend fibers are prepared by blending 20-30 parts by weight of modified aramid fiber and 30-40 parts by weight of Solona PTT fiber. The blend fibers are then knitted on a 32G single-sided circular knitting machine to obtain knitted fabric. S3.2: Dye the knitted fabric, dry it to obtain the dried knitted fabric, immerse the knitted fabric in a composite shell-core hybrid emulsion, dip and nibble twice, with a pick-up rate of 80% and an immersion time of 20-30 minutes, then pre-dry at 80-82℃ for 3-5 minutes, and then dry at 110-120℃ for 3-5 minutes to obtain the finished knitted fabric. S3.3: The finished knitted fabric is stretched and set, and then the hot melt glue machine is preheated to 170-180℃. The stretched and set knitted fabric is sprayed with glue. Immediately after the glue spraying is completed, the TPU film is laminated to the knitted fabric and then hot-pressed by an LP-type vertical press with a pressure of 0.3-0.5MPa and a speed of 6.5-7m / min. After the heat treatment is completed, the down-proof knitted fabric is obtained.
5. The lightweight down-proof knitted fabric for down jackets according to claim 4, characterized in that, In step S3.1, the knitting process specifically involves the following stitches: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, and 27 (plain weave); 2 and 18 (float, plain weave, float, tuck, float, plain weave); 4 and 16 (tuck, float, plain weave, float, plain weave, float); 6, 8, 10, 12, and 14 (float, tuck, float, plain weave, float, tuck); and 20, 22, 24, 26, and 28 (plain weave, float, tuck, float, tuck, float).
6. The lightweight down-proof knitted fabric for down jackets according to claim 4, characterized in that, In step S3.1, the plain weave section has a yarn length of 100-125mm / 50 loops, and the jacquard section has a yarn length of 50-70mm / 50 loops.
7. The lightweight down-proof knitted fabric for down jackets according to claim 6, characterized in that, In step S3.1, the preferred thread length for the plain weave section is 105-110mm / 50 loops, and the preferred thread length for the jacquard section is 65-70mm / 50 loops.
8. The lightweight down-proof knitted fabric for down jackets according to claim 4, characterized in that, The amount of adhesive sprayed in step S3.3 is 1.5-1.8 g / m³. 2 .